Compressor



S. BOUSKY July 4, 1950 COMPRESSOR Filed April .23, 1947 IN V EN TOR. SAMUEL BOUS KY ATTORNEY Patented July 4, 1950 UNITED STATES PATENT OFFICE A COMPRESSOR Samuel Bousky, Shaker Heights, Ohio, assignor to Jack & Heintz Precision Industries, Inc., Cleveland, Ohio, a corporation of Delaware Application April 23, 1947, Serial No. 743,342 4 Claims. (01. 230-206) This invention relates in general to compressors and more particularly to hermetically sealed refrigeration motor-compressor units.

One Of the primary objects of the invention is to provide such a compressor with means inherent in its construction for insuring the automatic separation of lubricating oil from the gas refrigerant by centrifugally throwing the oil radially outwardly against the inside wall of-the compressor housing.

Another object is to provide simple and effective means of trapping the oil near the outlet end from the inside housing wall and returning it back toward the inlet end by employing a component force of the rotating gas.

A further object is to provide such a compressor with means inherent in its construction for effectively transferring the heat of the com-,

pressed refrigerant gas to the compressor housing wall by means of intimate contact effected by centrifugal action of the gas brought about by the novel arrangement of the rotor concentrically around the stator and closely adjacent the housing.

With the foregoing and other objects in view, the invention resides in the combination of parts and in the details of construction hereinafter set forth in the following specification and appended claims, certain embodiments thereof :being illustrated in the accompanyin drawing which is a view in longitudinal section taken through the housing, showing the stator, rotor, compressor pump and catch baffle in section and the oil return helix in elevation.

Referring more particularly to the drawing, the hermetically sealed motor compressor unit housing is shown at l, with an inlet 2 and an outlet 3 for the refrigerant gas. The usual rotary type compressor for compressing the refrigerant gas is generally shown at 4 and is mounted to rotate on an eccentric portion 5 of the main rotary shaft 6, both of which are provided with spiral grooves 1 for conveying lubricating oil to the bearings. The electric motor comprises a rotor B that rotates with shaft 6 and a stator 9.

As distinguished from conventional practice, the rotor is mounted to rotate concentrically around the stator. Moreover, the outer cylindrical wall of rotor 8 is in close proximity to the inner Wall of the housing so that only a small clearance exists between the rotor and the housing.

One highly beneficial result obtained by this construction is that of cooling. Refrigerant gases which have been compressed by the pump 4 must pass through the small clearance space between the rotor 8 and housing I before they can be expelled through the outlet 3. The high speed of rotation of the rotor causes the gases passing through this small clearance space to be urged into a swirling rotation. The centrifugal forces acting on the gases produce a pressure acting radially outwardly against the housing inner wall, making the point of highest pressure one that acts against the housing wall. This materially enhances the transfer of heat to the housing from which the heat may be readily dissipated on the outside by means ofexternal structural fins or circulation of free air, or both, as may be desired.

Another highly beneficial result obtained by this construction is that of separation of the lubricating oil from the refrigerant gas and the insuring against expelling of oil through the housing outlet. The rotation of the rotor sets up centrifugal forces that act upon the particles of gas and oil mixture which are rotating in the small clearance space between the rotor and the housing. This causes all the heavier particles of oil to be separated from the gas and thrown outwardly against the housing wall.

In addition there is shown at It! a fiat helix strip. This helix may be secured to the inner wall of the housing. The important feature is that it is disposed between the rotor and the housing and that it extends helically along the inside of the housing. Also of importance is the fact that the helix is so formed, with respect to the direction of rotation of the rotor, that rotation of the refrigerant gases against it will produce a force component on the leading edge of the strip that will direct the oil flow downwardly toward the inlet end of the housing.

As a further precautionary measure, there is also preferably provided a catch bafile II on the interior of the housing at its outlet end. This bafiie serves the purpose of entrapping oil against escape through the housing outlet, which oil may have reached the top of the housing during the starting of the compressor pump or as a result of frothing of the oil. Oil which is caught by this bafile is held until the compressor stops and is then returned by gravity during the off cycle of the compressor.

I claim:

1. A refrigeration hermetically sealed motor compressor unit having a compressor and a housing with an inlet and an outlet, the rotor of said motor being arranged radially concentrically about the stator thereof and a longitudinally spiral member carried by the inner wall of said housing between said rotor and housing for returning the oil back from said outlet toward said inlet due to the force set up by the rotation of said rotor.

2. A refrigeration hermetically sealed motor compressor unit having a compressor and a housing with an inlet and an outlet, the rotor of said motor being arranged radially concentrically about the stator thereof and adjacent the inner Wall of said housing for the purpose of enhancing transfer of the heat of the rotating gas to said housing and a longitudinally spiral member carried by the inner wall of saidhousing'between I I n r from said outlet toward said inlet due to the 'force said rotor and housing for returning the oil'back set up by the rotation of saidv'rotor.

3. A hermetically sealed motor compressor unit having a compressor and a housing with an inlet and an outlet, the rotor of said motor being 7 -arrangedradiallyconcentricallyabout the stator thereof for the-purpose of'enhancing transfer-of theheat of 'therotating'gas to" said housing and for the purpose of'centrifugal separation of lubricant in said housing anda longitudinally spiral 'member carried by the inner-wall of saidhousing between said rotorand housingforreturning the oil-due to the centrifugal'force set up by the ro- -ta'tion of" said rotor; Y

. 10 ,for returning the oil back from said outlet toward said inlet due to the force set up by the rotation .of'said rotor.

SAMUEL BOUSKY.

-REFERENCES CITED The following references areof record in the E --file of this patent:

UNITED STATES PATENTS 20 Number Name Date -2,01'7;624 Janzen not. 15,-1935 '25053j425 "Else "Sept. 8,1936 2,178,811 Sateren Nov. 7, 1939 2,199,486 Doeg May 7, 1-940 25 2,228,364 Philipp Jan. 14, 1941 '2, 273;840 'Dever Feb. 24, 1942 $283,025 *Wolfer't -21 May 12, 1942 

